A computer program product comprises a computer usable medium. The computer usable medium has a computer readable program such that when the computer readable medium is executed on a computer, the computer is caused to receive a request from a calling service. Further, the computer is caused to determine reply-to endpoint information from the request. The reply-to endpoint information indicates the calling service as a calling service response endpoint. In addition, the computer is caused to monitor functionality of the calling service. The computer is also caused to update the reply-to endpoint information to indicate an alternative calling service as the calling service response endpoint if the functionality of the calling service is impaired prior to availability of response data for composition of a response.